Work-holding attachment for grinding-machines.



B. F. CLARK.

WORK HOkDING ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED JULY 14. 1914.

1,155,218, PatentedSept. 28, 1915.

2 SHEETSSHEET I.

WITNESSES INVENTOR COLUMBIA PIAANOGRAIH c0.,wAsl-I!NOTON, uv

B. F. CLARK. WORK HOLDING ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED JULY I4, 1914.

Patented Sept. 28, 1915.

2 SHEETS-SHEET 2 T3. 31 1 MAWN WQWNA WITNESSES M ew COLUMBIA PLANOORAFH c0 WASHINGTON, D. c.

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BENNETT r. cLAnK, OFNIAGARA rnL'Ls, NEW ronn'nssreNon ro 'rnnoennonunnnri COMPANY, OF rneiina FALLS, NEW YORK, A CORPORATION or PENNSYLVANIA.

wean-HOLDING ATTACHMENT roe GRINDING-MACHINES.

Application filed July 14, 1914. Serial No. 850,902.

'1 b all whom it may concern:

Be it known that I, BE NETT F. CLARK, a citizen of the United States, residing at Niagara Falls, in the county of Niagara and State of New York, have invented a new and useful Improvement. in Work-Holding Attachments for Grinding-"Vlachines, of

which the following is full, clear,- and exact description, reference being had to the V accompanying drawings, forming. part of this specification, in which Figure 1 is an end view of a grinding wheel having my attacl'unent applied thereto; Fig. 2 is a perspective view showing the application of theattachment to the grinding wheel; and Fig. 3 is a view partly in elevation and partly in section of the attachment. 7

My invention has relation to a w0rk-holding attachment for grinding wheels, the objeet being to provide a simple and efficient device for holding edged tools of various kinds and sizes, such as chisels and plane bits, in a manner to permit them to be accurately and quickly sharpened. My invention also provides a work-holding attachment of this character which can be readily applied to existing grinders.

Referring to the accompanying drawings, the numeral 2 designates a bracket member or supporting arm having at its, lower end a lug or ear 8, carrying aclamping screw 4, by means of which it may be attached to the frame of the grinder. In the particular construction of the grinder illustrated in the drawing, the frame has a fork member 5, to receive the shank or stem of the clamping screw 4. between the clamping nut 6 and the head 7. The supportingmember or bracket 2 carries at its upper end the rod 8, which extends transverselv of the periphery of the wheel and upon which is pivotally mounted the work-supporting plate 9. "This plate is shown as having depending lugs or ears 10, which are shaped to engage and loosely turn.

upon the rod 8. Secured to the plate 9 is a bent holding spring 11, for the chisel, plane bit or other edged tool to be sharpened.

The holding portion of this spring extends above the central portion of the upper surface of the plate 9, in position to hold the tool between it and said plate. The tool is slipped under this spring and against the upwardly projecting stop lugs 12.

When the supporting member or bracket 2 Specification of Letters Patent.

Patented Sept. es, rein.

is clamped to the frame member 5, the guide rod or bar 8 is held rigidly in a position sub stantially parallel with the axis of, the grinding wheel A, andat a distance from the periphery of the same. The member 9 is not only pivotally engaged with the said guide bar or rod, but can also be moved longitudinally thereon, in bringing dilfere'nt portions of the edge of the tool on to the grinding wheel. 7

Thedevice permits tools of widely varying width and thickness to be properly held while being sharpened. After the support 2 is clamped in position as above described, the tool to be sharpened is slipped under the holding portion of the spring 11, and the perforations in the lugs or cars 10 are slidably and semirotatably, engaged with the guide bar or rod 8. The bevel required on thetool being sharpened can be obtained by sliding the tool along the stops 12 toward or away from the grinding wheel; or by rotating the work holder on the guide bar or red; or by rotating the complete attachment at the point where it. is attached to the frame of the grinder. The grinding wheel proper rotates toward the work. The memher 9 is turned on the guide bar or red until the edge nortion of the tool comes in contact with the grinding wheel, when it is moved slowly to and fro on the guide bar or rod until properly sharpened.

I do not desire to limit myself to the particulardetails of construction and arrangement of the parts as herein shown and described, and it is obvious that the details thereof may be changed in many respects,

without departing from the spirit and scope I of the invention as defined in the appended claims.

I claim: l. A work holder attachment for grinders, comprising a supporting bracket, a

guide member connected thereto and extend,

ing in a direction substantially parallel to the axis of the grinding wheel, a work hold I ing 'member having a plurality of down wardly extending lugs, said'lugs having ears which engage the guide member, there being a space between said ears to permit the carrier to be removed from the bracket; substantially as described.

2. A work holder attachment for grinders, comprising a bracket, means for adjustably securing the bracket to the frame of the grinder, Said bracket hating an arm eitending atright angles to the axis of the rinding Wheel and" over the ijeiipheiy of the Wheel, a guide member carried by the arm and extending in a direction substan tially parallel Witli'the axie'o'f the grinding Wheel, a 'work holding member hay ng downwardly extendlng lugs, ears extending 7 downwardly from said lugs engaging the guide member, said ears forming stop s for the work holder, there belng a spade between the, ears to permit vthegre1iioval of the Wdrk holder When moved out of its.ner1nalfposi-' tion; substantially as described; a V

-3. A; tool-holding device for grinders,- eomprising aguide memberarranged tb'ex- C epiesof this iatent may' be ohtained for :Wheel in a direetien substantiall parallel t6 the arii's (iii Said Wheel," tvork siipjidrting plate slidably and rtatablyengagdwith the guide member, and vspring'clip car ried by eaid plate and ada itedtdhold the @Wcbrk thereon, said plate-having stops for one side, 'of the Work, substantially aS- de- I Hmrgennr J. RANDALL, Emmi: J. TANNER;

five cents each, by addr e ssillg the Commissiiin'er of iatefit Washington, D. G. t i

tend adjaeent to the periiihe rfy (if a grinding 

